CSLB Class B General Contractor's License Practice Exam

What is the condensate line in a water heater for?

1. Draining excess water

2. Releasing pressure

3. Providing combustion air

4. Temperature regulation

The correct answer is: Draining excess water

The condensate line in a water heater is specifically designed to carry away the excess water that can be produced during the combustion process in gas water heaters or from the condensation of vapor within the tank. When gas is burned to heat the water, it generates combustion gases, which can lead to moisture formation. This moisture can accumulate in the unit and needs a proper way to be discharged to ensure the water heater operates efficiently and safely. Draining excess water helps prevent flooding within the unit or plumbing system, maintains optimal functioning of the heater, and minimizes the risk of corrosion or damage to structural components. Proper drainage through the condensate line is essential to keep the system functioning effectively over time. The other options do not accurately describe the function of the condensate line. Releasing pressure is typically managed through a pressure relief valve, while combustion air is needed for the gas combustion process but is handled via different vents and openings. Temperature regulation is primarily achieved through the thermostat in the unit, not through any condensate line.